Microsoft Office Communications Server 2007 R2 Group Chat group policies can be configured manually by using the registry or by Group Policy objects (GPOs).

Only one instant messaging client can be the enabled when both Group Chat and Communicator 2007 R2 are installed on the same computer. You must disable instant messaging for one of the clients. See Group Policy DisableIM for Group Chat in the following table.

Group Chat Group Policies are summarized in the following table.

Group Chat Group Policies

Policy Name Definition


Disables instant messaging for a specific client. Use this policy to disable instant messaging for either Group Chat or Office Communicator 2007 R2. Only one IM client can be the default IM client for the computer where this policy is enabled.

When DisableIM is configured, the following behavior is expected:

  • Group Chat rejects all IM invites. Office Communicator 2007 R2 receives all IM invites.

  • IM Contacts do not display in the My Channels List.

  • When launching an IM from the Participant list or by clicking a user in the chat display, a Communicator 2007 R2 conversation window opens.


This Group Policy specifies a name for the new account. This name appears in the Group Chat client login form as an available account.


Enabling this policy allows users to configure accounts in addition to the one specified by this GPO, so they can log on to different servers.

Disabling this policy will prevent users from creating and editing custom accounts.


This policy allows the URI of the Lookup Server that will vend Channel Server URIs to be specified.

The Lookup Server’s URI is normally assumed based on the user’s SIP URI, which is not reliable if users are allowed to have multiple namespaces for their SIP URIs.

Options: Enter the Lookup Server URI in provided field.


This policy allows account information to be configured by the Microsoft Office Communications Server 2007 R2 Group Chat Administration Tool.

Options: Select the check box, or enter the global catalog’s fully qualified domain name in the provided field.

IMPORTANT: If the Auto detect global catalogcheck box is not selected, a value MUST be entered into the Manually Enter Global Catalog FQDNfield.

Check the Allow Non SSL Active Directory Connectionscheck box to allow non-SSL connections. SSL provides secure, encrypted connections.

Set the Maximum Search Result Countvalue. Clicking the arrow controls of the number field increases or decreases the number in increments of 100. It can also be manually entered. This defines the maximum return when an Active Directory search, such as a user search, is performed within Microsoft Office Communications Server 2007 R2 Group Chat Server.

This value applies only to the Administration Tool. User searches through the desktop client are limited to 20 users returned.


Forces the user to provide logon credentials rather than automatically using Windows credentials to authenticate the user by using NTLM or Kerberos protocol.


Specifies the host, protocol, and port that Group Chat uses to connect to Office Communicator 2007 R2.


Enabling this policy and selecting Disallow peer-to-peer file transfer prohibits private channel-to-private channel file transfer.

Allow client to edit account configuration

Enabling this Group Policy allows clients to log on with an account other than the one specified by this GPO.

Disabling this policy restricts all client-configured accounts except the account specified by this GPO.

If the administrator wants to lock the users into using only this account, disable this policy. The client will no longer have write permissions to the Edit Accounts window. It will be read-only.